WTEC - Model FAD - Deferrization, Demanganization Filters - Brochure

FAD deferrization, demanganization filters allow to remove from the water the iron and manganese in a non-oxidised form. FAD filters are usually used before a preliminary oxidation treatment, with air or more frequently, with sodium hypochlorite, or other oxidising agents (e.g. potassium permanganate). The initial oxidation stage allows, in presence of iron, the oxidation from Fe2+ to Fe3+ that precipitates as hydroxide. The removal of manganese is through a catalytic process following an in-line chlorination. The oxidation of the soluble manganese is through free chlorine by the catalytic action of the mineral granules in the filter bed. FAC active carbon filter is used for the removal of the exceeding remaining chlorine, at the bottom of the FAD filter.